Final answer:
El Niño is the warm phase of the El Niño Southern Oscillation (ENSO) and is associated with various global changes in weather patterns. It can cause an increase in severe winter storms.
Step-by-step explanation:
El Niño is the warm phase of the El Niño Southern Oscillation (ENSO). It occurs when a band of warm ocean water develops in the central and east-central equatorial Pacific, including off the Pacific coast of South America. El Niño is associated with various global changes in weather patterns, including an increase in severe winter storms. These storms can bring heavy rainfall, flooding, and other extreme weather events.